A girl starts from rest and reaches a walking speed of 1.4 m/s in 3.0 s. She walks at this speed for 6.0 s. The girl then slows down and comes to a stop in 10 s. What was the girl’s...

A girl starts from rest and reaches a walking speed of 1.4 m/s in 3.0 s. She walks at this speed for 6.0 s. The girl then slows down and comes to a stop in 10 s. What was the girl’s acceleration during each of the three time periods? What was her acceleration for the entire trip?

We have three time intervals to consider here. In the first, the girl starts at 0 m/s and reaches 1.4 m/s in 3 seconds. The acceleration is given by (v - u)/t, where v is the final velocity, u is the initial velocity and t is the time taken.

a = (1.4 - 0)/3 = 7/15 m/s^2.

In the second interval of time, the girl travels at a constant speed of 1.4 m/s for 6 seconds. The acceleration during this interval is 0.

In the third interval, the girl slows down from 1.4 m/s and comes to a halt in 10 seconds. The acceleration here is -0.14 m/s^2.

Over the entire trip the acceleration is 0 as the initial velocity and the final velocity are equal.

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Okay, sorry.. I had to edit my question so it would fit! the real quesiton is:

A girl starts from rest and reaches a walking speed of 1.4 m/s in 3.0 s. She walks at this speed for 6.0 s. The girl then slows down and comes to a stop during a 10.0-s period. What was the girl’s acceleration during each of the three time periods? What was her acceleration for the entire trip?